Lathe-chuck



(N5 Model.) 2 Sheets-Shet' 1. G. F. FULMER & W. E. KELVIE.

LATHE 01111011 Patented June -30, 1891.

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(No Model.) 2 Sheets-Sheet 2.

O. F. PULMER & W. E. KELVIE LATHE CHUCK.

Patented June 30,1891.

IIVVEIVTOR 2T ATTORNEYS NITED STATES PATENT OFFICE.

CHARLES F. FULMER'AND WILLIAM E. KELVIE, OF- PLAINFIELD, NEW

JERSEY.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 455,195, dated June 30,1891. Application filed December 18 1890. Serial No. 375,066. (Nomodel.)

To all whom it may concern;

Be it known that we, CHARLES F. FULMER and WILLIAM E. KELVIE, both ofPlainfield, in the county of Union and State of New J ersey, haveinvented a new and useful Lathe- Ch uck, of which the following is afull, clear, and exact description.

The objects of this invention are to provide a simple, durable, andconvenient device of the class indicated which will afford means to griparticles of a regular contour or pieces which are of an irregular form..

To these ends our invention consists in the construction of the chuckso. that its jaws may be simultaneously moved'or each jaw separatelyadjusted; and it further consists in the peculiar construction andcombination of the parts, as is hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the views.

Figure 1 is a rear view of the chuck with the hub-plate broken away,showing a locking-lever in place. Fig. 2'is an edge view of that part ofthe device embraced between the lines 2 2 in Fig. 1. Fig. 3 is an axialtransverse section taken on the line 3 3 in Fig. 1. Figs. 4, 5, and 6are detached views of important details embodying features of theinvention.

The face-plate A of the chuck is circular and of any desired size thatwill be most convenient for its service.

To render the face-plate A strong and capable of resisting strains it issubjected to in use, a proper number of radial braces b are provided,which extend from a circular flange 0 located near the center of theface-plate on its rear side to intersect a circumferentialrearwardly-projecting flange a, all being cast integral with the plate.

There are four radial slots 6 cut through the face-place A oppositely inpairs and evenly spaced apart, which have rearwardly-exte-nding flangese formed on their edges. The slots 6 are each rendered true and parallelon opposite edges to adapt them to receive the jaws B and permit them toslide throughout the extent of the slots, there being a single jaw foreach slot furnished with T -shaped 1ntegral guide-ribs g, which fitmating grooves cut in the sides of the slots in thebody of theface-plate A, thus providing an interlocking engagement of the jaws withthe face-plate, which will allow the jaws to move in the slots withoutrattle, and as this engagement of parts extends throughout the length ofeach jaw, as shown in Fig. 3, great strength s afforded at the points ofsliding connection, which will resist the longitudinal rocking strainthat has a tendency to lift the inner ends of the jaws.

There is an integral center hub 0 formed on the face-plate A, which isconcentrically grooved a proper depth from the rear side of the plate,thus dividing the hub into two concentric flanges c c as far as thegroove 0 extends in the hub, said groove receiving parts which will bedescribed.

The jaws B are of the usual form on their outer faces, being cut intosteps d, that afford means to grip and hold pieces of work of dif ferentsizes. These steps may be of any desired number proportioned to thecapacity of the chuck. Each jaw B is furnished with a nut h, whichextends at right angles therefrom on the side that engages theface-plate A. Said nuts, being fitted into the slots 6 when the partsare assembled, may be integral portions of the jaws B or be formedseparately and secured thereto, as shown in Fig. 3, by a screw 01, whichwill permit the jaws to be reversed endwise and hold material by theiroutward movement. The nuts h are perforated and threaded to receive theadjusting screws D, which are of similar form, and each screw, fittingits respective nut without looseness, extends from the peripheral flangea to the flange 0 which flanges are perforated in radial alignment toreceive the journal ends of the screws. The inner end portion of eachscrew D extends across the groove 0 in the hub O and has its reduced endstepped 'into a socket formed in the flange c, as shown in Fig. 3, abevel-pinion E being mounted on and secured to the portion of eachscrew-body that is located in the groove 0, the outer end portions ofthe screws being journaled to rotate within the perforations of theperipheral flange a, a counterbored socket-hole being formed around theprojecting end of each screw, which ends are squared to receive a wrench(not shown) that will fit thereon and within the counterbores.

The ring F (shown detached in Fig. 6) is furnished with radial teeth onone face, which are beveled and cut to mesh with the bevelpinions E whenthe ring is seated in the groove adjacent to the pinions, said gearringbeing introduced within the groove from the rear side of the face-plateA.

Upon the gear-ringF a cam-ring G is loosely imposed, which is keyed tothe grooved hub C, as shown by dotted lines in Fig. 1, projecting keys 1at opposite points entering notches 1'. in the cam-ring, so as toprevent it from revolvin Upon the side of the ring G which is not incontact with the ringF four similar cam projections m are formed, whichare equal distances apart and slope in the same direction.

The rear edge of the concentric flange c is cut away on the inner edgeto form a seat for the cam-ring I, that loosely engages said groove,which latter is of such a proportionate depth as will allow four similarsloping projections n to have a wedging action upon the projections m ofthe ring G when the camring I is moved to cause such an engagement ofparts, to enforce which a hub-plate J is located and secured outside ofthe loose camring I, axially coincident with the center of theface-plate A, which hub-plate retains the cam-rings and gear-ring intheir respective positions.

The thickness of the cam-rings G and I is so proportioned to that of thegear-ring F, as well as the depth of the groove 0 from the bottom of theteeth in the pinions E to the inner face of the h ub-plate J, that thelateral revoluble movement of the loose cam-ring I by a handle 0 in onedirection will cause the sloping faces of the four projections n ontheloose cam-ring to impinge upon the similar sloping faces of theprojections m of the stationary cam-ring and force the teeth on thegear-ring F to have a positive engagement with the teeth 011 all thepinions E.

The handle 0, before mentioned, projects from the periphery of the loosering I between two of the flanges c, and is provided with aspring-actuated slide-bolt 0', that is adapted to interlock with one oftwo socket-holes 1) (shown in Figs. 2 and 3) when the bar is adjusted toforce the cam-ring G on the gearring F, or by an opposite movement toremove the projections n from the projections m and allow the gear-ringto lie loose upon the pinions E.

The hub-plate J is centrallyperforated and threaded of a size to fitupon. the threaded end of a lathe-spindle, (not shown,) which connectionof parts will secure the chuck upon the spindle for use to clamp andretain material therein to be operated upon by the lathe.

In using the chuck to retain apiece of material in position to be turnedor bored out on the lathe if such an article is circular on itsperiphery the chuck will then be adjusted to move all the pinions E andscrews D together by the use of a wrench applied to the square end ofone screw and revolubly moved in connection with it, which will slidethe fourjaws B in or out on the face-plate A to engage or release thematerial. Should the piece of material to be operated upon be of anirregular form, the handle 0 is shifted so as to release the cam-ring Gfrom pressure on the gear-rin g F, and thus permit anindependentmovement of each jaw by a manipulation of itsactuating-scre\v, whereby the jaws B may be set to impinge on a piece ofwork atfourpoints and bring the portion to be turned in the latheconcentric with the axis of the chuck.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-

In a lathe-chuck, the combination, with a radially-slotted circularface-plate and jaws provided with nuts adapted to slide in the slots ofthe faceplate and having stepped faces, of screws engaging the nuts onsaid jaws, bevelpinions on the inner ends of said screws, a bevel facedgear ring normally imposed loosely on said pinions, a non-rotatablecamring bearing on the gear-ring and having radial cam projections onone face, a rotatable cam-rin g bearing on the first-named cam-ring andprovided with. radial cam projections mating the cam projectionsthereon, and a locking-handle carried by the rotatable cam-ring, havinga spring-actuated slide-bolt, which will enter either of thesocket-holes p in the flange c and retain the gear-ring in gearedcondition with the pinions or hold the cam projections it and mseparated, substantially as set forth.

CHARLES F. FULMER. \VILLIAM E. KELVIE. 'Witnesses:

SAMUEL A. CLoUsToN, JOHN W. DIXON.

